材料期刊网

以铝-分子筛(Al-MCM-41)为载体,采用加热回流法制备一种非均相芬顿催化剂还原氧化石墨烯-羟基铁/Al-MCM-41(rGO-FeOOH/Al-MCM-41).以喹啉模拟有机废水,考察该催化剂在不同氧化体系、不同H2O2投加量、不同催化剂投加量和不同水质因素(喹啉初始浓度和pH值)条件下对喹啉降解效能的影响,同时考察了催化剂的重复使用性.结果表明,喹啉的光芬顿降解过程符合准一级反应动力学,降解过程中溶液中的NO3-浓度先升高后下降,表明喹啉的吡啶环被打开.对比芬顿反应,模拟日光芬顿反应中光的引入促进羟基自由基的产生,使得喹啉去除率由45％提高到了99％;喹啉降解速率随着催化剂和H2O2投加量的增加而升高,但投加量过多会消耗.OH自由基从而抑制喹啉降解,在光芬顿体系中,该催化剂在pH=3.6-9.6的范围内都表现出了很高的活性;当喹啉初始浓度为20 mg· L-1,催化剂投加量为0.5 g·L-1,H2O2投加量为20 mmol· L-1,pH=6.3时,该催化剂对喹啉有很好的矿化效果(TOC去除率为3％).催化剂重复使用性能稳定,重复使用5次喹啉去除率仍高达99％,但TOC去除率略有降低,铁溶出率为0.48％以下.

The heterogeneous Fenton catalyst reduced graphene oxide-goethite supported on Al-MCM-41 (rGO-FeOOH/Al-MCM-41) was prepared by the heating reflux method.The effects of oxidation system,catalyst dosage,H202 amount and water quality conditions (initial concentration of quinoline and pH) were investigated for quinoline degradation.The reuse of rGO-FeOOH/Al-MCM-41 was also evaluated.The results showed that quinoline degradation using heterogeneous photo-Fenton method was well-fitted to a pseudo-first-order kinetic model.The concentration of NO3-in the solution increased firstly and then decreased,which indicated the opening of pyridine ring.In comparison with Fenton reaction,the generation of hydroxyl radicals was promoted by simulated sunlight in the photo-Fenton reaction.The quinolone removal efficiency increased from 45％ to 99％.The quinolone removal efficiency increased with the catalyst and H2O2 dosage.However,excessive dosage consumed too much · OH radicals and inhibited quinoline degradation.In photo-Fenton system,the catalyst exhibited higher activity than that in the Fenton reaction system in a wide pH range (3.6-9.6).Under the optimal condition (20 mg· L-1 of initial quinoline concentration,0.5 g·L-1 of catalyst dosage,20 mmol·L-1 of H2O2 dosage,pH=6.3),quinolone and TOC removals were 99％ and 3％,respectively.Moreover,the catalyst naintained high activity for quinoline removal (99％)after five times use,but TOC removal decreased slightly.The dissolution rate of Fe was below 0.48％.